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        // Math   数学
        console.log(Math.max(1,2,56,78,5,4));
        console.log(Math.min(1,2,56,78,5,4));

        console.log(Math.round(-1.5));  // 四舍五入  +0.5 取整

        console.log(Math.floor(-1.1));  // 向下取整

        console.log(Math.ceil(-1.1));  //向下取整

        console.log(Math.random());   // 0-1的随机数 包括0 不包括1
    </script>
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